Large percentage, yes. The issue is the "not large percentage" part. Sugar, additives, preservatives, colors... all of these are toxic. And when you mix up beef steak with sausage... you won't get realistic results.

That's like asking "what's the issue if somebody salts the soup with cyanide, most of the meal will still be soup". Yeah, but the cyanide will still kill you, even if it is the small percentage.